Puppet users - Jun 2014 - puppetdb, puppet master, puppet agent and facter compatibility

Hi all, 
I have an installation with puppetdb 1.6.3, puppet master 3.4.3, agents 
ranging from 2.7 to 3.4 and various facter versions, up to 2.X

Now I'm evaluating to upgrade this installation starting from puppetdb and 
then down the pipe, but even looking at documentation I'm not sure about 
the requirements. That means: can I update to puppetdb 2.X first? does 
puppetdb cares about agents/facter version or relies only on master version?

With a broader scope, is there any small table with requirements? It would 
be definitely helpful in planning updates in "difficult" environments
(i.e.
lots of different versions, machines and so on.)

Many thanks for any answer.

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